Coffee-making apparatus



2, 1 M. CAVICCII-HOLI 2,366,384

COFFEE MAKING APPARATUS 7 Filed April 24, 1944 000000 IOC COOOOO I N VEN TOR. WA e/a CA V/CC/l/OL 7 BY WTW Patented Jan. 2, 1945 UNITED STATES PATENT OFFICE COFFEE-MAKING APPARATUS Mario Gavicchioli, New York; N. Y.

Application April 24, 1944, SerierNo. 532,523

6' Claims.

This invention relates to new and useful improvements in coffee makin apparatus.

In the typical cofiee maker, the boiling water is-manually poured through the coffee grindings contained in a filter bag. The weak cofiee extract is then manually drawn oiT and repoured through the grindings. This is a time consuming and hazardous operation. since the danger of scalding is always present.

Devices have been made to provide automati recirculation of the weak coffee through the grindings, but. such devices have proven expensive, difficult-to maintain and faulty in operation.

Such devices invariably use a separate water or steam operated aspirator; or a suction pump, or a separate water jacket to condense steam in the storage urn to create the suction necessary for their operation.

An object of this invention is to provide for the automatic spraying of boiling water through the coiiee grindings by convection.

A further object of the invention is to provide for the automatic recirculation of weak cofiee extract until it reaches the desired strength by gravity flow and convection. 1

In the drawing forming part of this specification, the single figure is a sectional and principally diagrammatic view illustrating a complete coffee making assembly.

Referring to the drawing, one form of the invention shown combines as a unit, cofiee maker A, cofiee storage container B, disposed except for their covers, within a low-pressure water boiler C, which also. acts as a water jacket for the said coffee maker, and said cofiee storage container.

The coffee maker A consists, of a container 2, perforated drawer 3, tight fitting cover 4, depth gauge 5,. drainpipe 6 with cock 1. Pipe 8 provided with check valve 9 leads upward from the bottom of container 2 to annular chamber III. Said chamber is provided with a double bottom portion II containing perforations l2 around the lower periphery. Pipe l3 provided with valve I4 is connected by pipe [5 to valve l6, said valve having a tail pipe IT. The upper end of pipe I3 connects to pipe l8 leading from the bottom of cofiee storage container B, the lower end of said pipe I3 connects to a perforated pipe I 9 located inside the upper portion of container 2 of coffee maker A, and running its full length. Pipe 20, provided with valve 2| connects to the upper part of said annular chamber Ill, and extends upwardly terminating at end 22 in the inside upper part of container B.

Cofiee storage container B is provided with a tight-fitting cover 23, a dispensing valve 24 connected to the endoi pipe I8, and a gauge 25.

Low pressurewater boiler C is provided at its bottom with burner. 26 located in combustion housing 21, flues 28 lead from the top of, said housing and exhaust to the atmosphere, a cold water supply pipe 29 connects through valve 30 and float valve 3!, a steam pressure safety valve 32 is provided, and drain pipe 33 with cook 34 extends from said boiler C over a grilled coiTee drip-collecting apron 35 which extends across the front of the apparatus, said apron 35 being provided with. drain pipe 36. A gage 31 shows boiler water.

In making coffee with the apparatus shown in the figure, valves 14-, I6 and 2! are closed and the water in the boiler is brought to a boil. Drawer 3 is pulled out of coffee maker A and the required amount of grindings placed therein.- Valve I6 is then opened and boiling water is drawn by convection into pipe I! and through pipes I5 and I3 to perforated pipe I9 through which it is sprayed over the coffee grindings in drawer 3. When gauge 5 indicates that container 2 is filled,

. valve I 6 is closed and valve 2| is opened. The

coffee extract which flowed from container 2 into annular chamber [0 due to the pressure head, and which was heated in said annular chamber I0, is forced upwardly by convection through pipe 2!) into coffee storage container B. When gauge 25 indicates that the said container is full, valve 2| i closed. Coffee storage container B and coiTee maker container 2 can be made equal in volume 50 that one exactly empties into the other.

If it is desired to strengthen the coifee extract, valve I4 is opened and the contents of cofiee storage container B flows through pipes l8 and I3 to perforated pipe I9 through which it is sprayed over the coiiee grindings in drawer 3.

-Valve, I4 is then closed and valve 2| is opened dition. The spent coffee grindings are removed by pulling out drawer 3, boiling water is sprayed over the drawer and into the'container through perforated pipe I9, cover 4 is opened to scrub the inside of the coffee maker, and the wash contents are drained out through cock 1 into drip apron 35, and drained through pipe 36. The cofiee drip apron 35 is cleaned by boiling water obtained from cock 34. The said cock 34 i also used to drain out the low pressure water boiler C, the contents going into drip apron 35, and out through drain pipe v36.

The invention is not limited to any particular physical embodiment, but on the contrary is susceptible of being expressed in different structures and forms and certain of its features may be employed to the exclusion of others in view of the appended claims.

What is claimed is:

l. A coffee 'making apparatus comprising a low-pressure water boiler, a coffee storage container partially disposed inside said boiler so as to be jacketed by the water therein, said coffee storage container having an airtight cover accessible from the outside, and provided with a valve for the withdrawal of coffee; a coffee maker container partially disposed inside said boiler so as to be jacketed by the water therein, said coffee maker container having an airtight cover accessile from outside, and a coffee grindings receiving perforated drawer, accessible from the outside, in the upper part of said coffee maker container, a chamber disposed within said boiler and adapted to be heated, a downwardly extending check valve-controlled pipe leading from the bottom of said chamber to the lower portion of said coffee maker container, an upwardly extending valvecontrolled pipe leading from the top of said chamber to the upper part of said coffee storage container, a downwardly extending valve-controlled pipe leading from the bottom of said cofiee storage container to the upper inside portion of said coffee maker container.

A structure as specified in claim 1 in combination with a valve controlled pipe extending downwardly inside said boiler from said pipe last mentioned in claim 1.

3. A structure as Specified in claim 1 in which the chamber is annular in form and having a double bottom portion, the lower portion having perforations along its periphery.

4. An urn for coffee serving consisting of a low pressure water boiler, a coffee storage container partiallyv disposed inside said boiler so as to be jacketed by the water therein, said coffee storage container having an airtight cover and provided with a valve for the withdrawal of coffee, a chamber disposed within said boiler and adapted to be heated, a downwardly extending check valvecontrolled pipe leading from the bottom of said chamber to a source of coffee extract, and an upwardly extending valve-controlled pipe leading from the top of said chamber to the upper part of said coffee storage container.

5. A structure as specified in claim 4 in which the chamber is annular in form and having a double bottom portion, the lower portion having perforations along it periphery.

6. A structure as specified in claim 1 in combination with a valve controlled pipe extending downwardly inside said boiler from said pipe lastmentioned in said claim 1, and in which said structure the chamber is annular in form and having a double bottom portion, the lower portion having perforations along its periphery.

MARIO CAVICCHIOLI. 

